Utility knife



FIG. 1 is a perspective view of my new design.

FIG. 2 is a top view thereof.

FIG. 3 is a side view thereof.

FIG. 4 is a front view thereof.

FIG. 5 is a rear view thereof.

FIG. 6 is another side view thereof; and,

FIG. 7 is a bottom view thereof.

The broken line showings of the blade are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a utility knife, as shown and described. 